18018743 has 4 divisors (see below), whose sum is σ = 18043488. Its totient is φ = 17994000.

The previous prime is 18018739. The next prime is 18018761. The reversal of 18018743 is 34781081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34781081 = 47 ⋅740023.

It is a cyclic number.

It is not a de Polignac number, because 18018743 - 2² = 18018739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11246 + ... + 12747.

It is an arithmetic number, because the mean of its divisors is an integer number (4510872).

Almost surely, 2^18018743 is an apocalyptic number.

18018743 is a deficient number, since it is larger than the sum of its proper divisors (24745).

18018743 is an equidigital number, since it uses as much as digits as its factorization.

18018743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24744.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 18018743 is about 4244.8489961364. The cubic root of 18018743 is about 262.1650718587.

The spelling of 18018743 in words is "eighteen million, eighteen thousand, seven hundred forty-three".